/*
 * Copyright (C) 2012 www.amsoft.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ab.view.sliding;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;
import androidx.viewpager.widget.ViewPager;
import androidx.viewpager.widget.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.ab.adapter.AbFragmentPagerAdapter;
import com.ab.util.AbLogUtil;
import com.ab.view.sample.AbViewPager;

import java.util.ArrayList;
import java.util.List;

// TODO: Auto-generated Javadoc
/**
 * © 2012 amsoft.cn
 * 名称：AbSlidingTabView.java
 * 描述：滑动的tab,tab不固定超出后可滑动.
 *
 * @author 还如一梦中
 * @version v1.0
 * @date：2013-05-17 下午6:46:29
 */
@SuppressLint("NewApi")
public class AbSlidingTabView extends LinearLayout {

    /** The context. */
    private Context context;

    /** The m tab selector. */
    private Runnable mTabSelector;

    /** The m listener. */
    private ViewPager.OnPageChangeListener mListener;

    /** The m max tab width. */
    public int mMaxTabWidth;

    /** The m selected tab index. */
    private int mSelectedTabIndex;

    /** tab的背景. */
    private int tabBackgroundResource = -1;

    /** tab的文字大小. */
    private int tabTextSize = 30;

    /** tab的文字颜色. */
    private int tabTextColor = Color.BLACK;

    /** tab的选中文字颜色. */
    private int tabSelectColor = Color.BLACK;

    /** tab的线性布局. */
    private LinearLayout mTabLayout = null;

    /** tab的线性布局父. */
    private HorizontalScrollView mTabScrollView  = null;

    /** The m view pager. */
    private AbViewPager mViewPager;

    /** tab的文字. */
    private List<String> tabItemTextList = null;

    /** tab的图标. */
    private List<Drawable> tabItemDrawableList = null;

    /** 内容的View. */
    private ArrayList<Fragment> pagerItemList = null;

    /** tab的列表. */
    private ArrayList<TextView> tabItemList = null;

    /** 内容区域的适配器. */
    private AbFragmentPagerAdapter mFragmentPagerAdapter = null;

    /** The m tab click listener. */
    private OnClickListener mTabClickListener = new OnClickListener() {
        public void onClick(View view) {
            AbTabItemView tabView = (AbTabItemView)view;
            mViewPager.setCurrentItem(tabView.getIndex());
        }
    };

    /**
     * Instantiates a new ab sliding tab view.
     *
     * @param context the context
     */
    public AbSlidingTabView(Context context) {
        this(context, null);
    }

    /**
     * Instantiates a new ab sliding tab view.
     *
     * @param context the context
     * @param attrs the attrs
     */
    public AbSlidingTabView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        initView();
        FragmentManager mFragmentManager = ((FragmentActivity)this.context).getSupportFragmentManager();
        mFragmentPagerAdapter = new AbFragmentPagerAdapter(
                mFragmentManager, pagerItemList);
        mViewPager.setAdapter(mFragmentPagerAdapter);
        mViewPager.setOnPageChangeListener(new MyOnPageChangeListener());
        mViewPager.setOffscreenPageLimit(3);
        this.addView(mViewPager,new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

    }


    public AbSlidingTabView(Context context, AttributeSet attrs,int defStyle) {
        super(context, attrs,defStyle);
        initView();
        FragmentManager mFragmentManager = ((FragmentActivity)this.context).getSupportFragmentManager();
        mFragmentPagerAdapter = new AbFragmentPagerAdapter(
                mFragmentManager, pagerItemList);
        mViewPager.setAdapter(mFragmentPagerAdapter);
        mViewPager.setOnPageChangeListener(new MyOnPageChangeListener());
        mViewPager.setOffscreenPageLimit(3);
        this.addView(mViewPager,new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));


    }
    /**
     * Instantiates a new ab sliding tab view.
     *
     * @param fragment the fragment
     */
    public AbSlidingTabView(Fragment fragment) {

        super(fragment.getActivity());

        this.context = fragment.getActivity();
        initView();
        if(VERSION.SDK_INT <= 17){
            AbLogUtil.e(AbSlidingTabView.class, "AbSlidingTabView(Fragment fragment) 要求最低SDK版本17");
            return;
        }
        FragmentManager mFragmentManager = fragment.getChildFragmentManager();
        mFragmentPagerAdapter = new AbFragmentPagerAdapter(
                mFragmentManager, pagerItemList);
        mViewPager.setAdapter(mFragmentPagerAdapter);
        mViewPager.setOnPageChangeListener(new MyOnPageChangeListener());
        mViewPager.setOffscreenPageLimit(3);

        this.addView(mViewPager,new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

    }

    /**
     * Inits the view.
     */
    public void initView(){
        this.setOrientation(LinearLayout.VERTICAL);
        this.setBackgroundColor(Color.rgb(255, 255, 255));

        mTabScrollView  = new HorizontalScrollView(context);
        mTabScrollView.setHorizontalScrollBarEnabled(false);
        mTabScrollView.setSmoothScrollingEnabled(true);

        mTabLayout = new LinearLayout(context);
        mTabLayout.setOrientation(LinearLayout.HORIZONTAL);
        mTabLayout.setGravity(Gravity.CENTER);

        //mTabLayout是内容宽度
        mTabScrollView.addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.FILL_PARENT));

        this.addView(mTabScrollView,new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

        //内容的View的适配
        mViewPager = new AbViewPager(context);
        //手动创建的ViewPager,必须调用setId()方法设置一个id
        mViewPager.setId(1985);
        pagerItemList = new ArrayList<Fragment>();
        //定义Tab栏
        tabItemList = new ArrayList<TextView>();
        tabItemTextList = new ArrayList<String>();
        tabItemDrawableList = new ArrayList<Drawable>();

        //要求必须是FragmentActivity的实例
        if(!(this.context instanceof FragmentActivity)){
            AbLogUtil.e(AbSlidingTabView.class, "构造AbSlidingTabView的参数context,必须是FragmentActivity的实例。");
        }
    }

    /**
     * The listener interface for receiving myOnPageChange events.
     * The class that is interested in processing a myOnPageChange
     * event implements this interface, and the object created
     * with that class is registered with a component using the
     * component's <code>addMyOnPageChangeListener<code> method. When
     * the myOnPageChange event occurs, that object's appropriate
     * method is invoked.
     *
     *
     */
    public class MyOnPageChangeListener implements OnPageChangeListener{

        /* (non-Javadoc)
         * @see android.support.v4.view.ViewPager.OnPageChangeListener#onPageScrollStateChanged(int)
         */
        @Override
        public void onPageScrollStateChanged(int arg0) {
            if (mListener != null) {
                mListener.onPageScrollStateChanged(arg0);
            }
        }

        /* (non-Javadoc)
         * @see android.support.v4.view.ViewPager.OnPageChangeListener#onPageScrolled(int, float, int)
         */
        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
            if (mListener != null) {
                mListener.onPageScrolled(arg0, arg1, arg2);
            }
        }

        /* (non-Javadoc)
         * @see android.support.v4.view.ViewPager.OnPageChangeListener#onPageSelected(int)
         */
        @Override
        public void onPageSelected(int arg0) {
            setCurrentItem(arg0);
            if (mListener != null) {
                mListener.onPageSelected(arg0);
            }
        }

    }

    /* (non-Javadoc)
     * @see android.widget.LinearLayout#onMeasure(int, int)
     */
    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
        mTabScrollView.setFillViewport(lockedExpanded);

        final int childCount = mTabLayout.getChildCount();
        if (childCount > 1 && (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) {
            if (childCount > 2) {
                mMaxTabWidth = (int)(MeasureSpec.getSize(widthMeasureSpec) * 0.4f);
            } else {
                mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2;
            }
        } else {
            mMaxTabWidth = -1;
        }

        final int oldWidth = getMeasuredWidth();
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        final int newWidth = getMeasuredWidth();

        if (lockedExpanded && oldWidth != newWidth) {
            // Recenter the tab display if we're at a new (scrollable) size.
            setCurrentItem(mSelectedTabIndex);
        }
    }

    /**
     * Animate to tab.
     *
     * @param position the position
     */
    private void animateToTab(final int position) {
        final View tabView = mTabLayout.getChildAt(position);
        if (mTabSelector != null) {
            removeCallbacks(mTabSelector);
        }
        mTabSelector = new Runnable() {
            public void run() {
                final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2;
                mTabScrollView.smoothScrollTo(scrollPos, 0);
                mTabSelector = null;
            }
        };
        post(mTabSelector);
    }

    /* (non-Javadoc)
     * @see android.view.View#onAttachedToWindow()
     */
    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (mTabSelector != null) {
            // Re-post the selector we saved
            post(mTabSelector);
        }
    }

    /* (non-Javadoc)
     * @see android.view.View#onDetachedFromWindow()
     */
    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mTabSelector != null) {
            removeCallbacks(mTabSelector);
        }
    }

    /**
     * 描述：创造一个Tab.
     *
     * @param text the text
     * @param index the index
     */
    private void addTab(String text, int index) {
        addTab(text,index,null);
    }

    /**
     * 描述：创造一个Tab.
     *
     * @param text the text
     * @param index the index
     * @param top the top
     */
    private void addTab(String text, int index,Drawable top) {

        AbTabItemView tabView = new AbTabItemView(this.context);
        if(tabBackgroundResource!=-1){
            tabView.setTabBackgroundResource(tabBackgroundResource);
        }
        if(top!=null){
            tabView.setTabCompoundDrawables(null, top, null, null);
        }
        tabView.setTabTextColor(tabTextColor);
        tabView.setTabTextSize(tabTextSize);

        tabView.init(index,text);
        tabItemList.add(tabView.getTextView());
        tabView.setOnClickListener(mTabClickListener);
        mTabLayout.addView(tabView, new LayoutParams(0,LayoutParams.MATCH_PARENT,1));
    }

    /**
     * 描述：tab有变化刷新.
     */
    public void notifyTabDataSetChanged() {
        mTabLayout.removeAllViews();
        tabItemList.clear();
        final int count = mFragmentPagerAdapter.getCount();
        for (int i = 0; i < count; i++) {
            if(tabItemDrawableList.size()>0){
                addTab(tabItemTextList.get(i), i,tabItemDrawableList.get(i));
            }else{
                addTab(tabItemTextList.get(i), i);
            }

        }
        if (mSelectedTabIndex > count) {
            mSelectedTabIndex = count - 1;
        }
        setCurrentItem(mSelectedTabIndex);
        requestLayout();
    }

    /**
     * 描述：设置显示哪一个.
     *
     * @param item the new current item
     */
    public void setCurrentItem(int item) {
        if (mViewPager == null) {
            throw new IllegalStateException("ViewPager has not been bound.");
        }
        mSelectedTabIndex = item;
        final int tabCount = mTabLayout.getChildCount();
        for (int i = 0; i < tabCount; i++) {
            final AbTabItemView child = (AbTabItemView)mTabLayout.getChildAt(i);
            final boolean isSelected = (i == item);
            child.setSelected(isSelected);
            if (isSelected) {
                child.setTabTextColor(tabSelectColor);
                animateToTab(item);
            }else{
                child.setTabTextColor(tabTextColor);
            }
        }
    }

    /**
     * 描述：设置一个外部的监听器.
     *
     * @param listener the new on page change listener
     */
    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
        mListener = listener;
    }

    /**
     * 描述：设置tab文字的颜色.
     *
     * @param tabColor the new tab text color
     */
    public void setTabTextColor(int tabColor) {
        this.tabTextColor = tabColor;
    }

    /**
     * 描述：设置选中的颜色.
     *
     * @param tabColor the new tab select color
     */
    public void setTabSelectColor(int tabColor) {
        this.tabSelectColor = tabColor;
    }

    /**
     * 描述：设置文字大小.
     *
     * @param tabTextSize the new tab text size
     */
    public void setTabTextSize(int tabTextSize) {
        this.tabTextSize = tabTextSize;
    }

    /**
     * 描述：设置单个tab的背景选择器.
     *
     * @param resid the new tab background resource
     */
    public void setTabBackgroundResource(int resid) {
        tabBackgroundResource = resid;
    }

    /**
     * 描述：设置Tab的背景.
     *
     * @param resid the new tab layout background resource
     */
    public void setTabLayoutBackgroundResource(int resid) {
        this.mTabLayout.setBackgroundResource(resid);
    }

    /**
     * 描述：增加一组内容与tab.
     *
     * @param tabTexts the tab texts
     * @param fragments the fragments
     */
    public void addItemViews(List<String> tabTexts,List<Fragment> fragments){

        tabItemTextList.addAll(tabTexts);
        pagerItemList.addAll(fragments);
        mFragmentPagerAdapter.notifyDataSetChanged();
        notifyTabDataSetChanged();
    }

    /**
     * 描述：增加一组内容与tab.
     *
     * @param tabTexts the tab texts
     * @param fragments the fragments
     * @param drawables the drawables
     */
    public void addItemViews(List<String> tabTexts,List<Fragment> fragments,List<Drawable> drawables){

        tabItemTextList.addAll(tabTexts);
        pagerItemList.addAll(fragments);
        tabItemDrawableList.addAll(drawables);
        mFragmentPagerAdapter.notifyDataSetChanged();
        notifyTabDataSetChanged();
    }

    /**
     * 描述：增加一个内容与tab.
     *
     * @param tabText the tab text
     * @param fragment the fragment
     */
    public void addItemView(String tabText,Fragment fragment){
        tabItemTextList.add(tabText);
        pagerItemList.add(fragment);
        mFragmentPagerAdapter.notifyDataSetChanged();
        notifyTabDataSetChanged();
    }

    /**
     * 描述：增加一个内容与tab.
     *
     * @param tabText the tab text
     * @param fragment the fragment
     * @param drawable the drawable
     */
    public void addItemView(String tabText,Fragment fragment,Drawable drawable){
        tabItemTextList.add(tabText);
        pagerItemList.add(fragment);
        tabItemDrawableList.add(drawable);
        mFragmentPagerAdapter.notifyDataSetChanged();
        notifyTabDataSetChanged();
    }


    /**
     * 描述：删除某一个.
     *
     * @param index the index
     */
    public void removeItemView(int index){

        mTabLayout.removeViewAt(index);
        pagerItemList.remove(index);
        tabItemList.remove(index);
        tabItemDrawableList.remove(index);
        tabItemTextList.remove(index);
        mFragmentPagerAdapter.notifyDataSetChanged();
        notifyTabDataSetChanged();
    }

    /**
     * 描述：删除所有.
     */
    public void removeAllItemViews(){
        mTabLayout.removeAllViews();
        pagerItemList.clear();
        tabItemList.clear();
        tabItemDrawableList.clear();
        tabItemTextList.clear();
        mFragmentPagerAdapter.notifyDataSetChanged();
        notifyTabDataSetChanged();
    }

    /**
     * 描述：获取这个View的ViewPager.
     *
     * @return the view pager
     */
    public ViewPager getViewPager() {
        return mViewPager;
    }

    /**
     * 描述：设置每个tab的边距.
     *
     * @param left the left
     * @param top the top
     * @param right the right
     * @param bottom the bottom
     */
    public void setTabPadding(int left, int top, int right, int bottom) {
        for(int i = 0;i<tabItemList.size();i++){
            TextView tv = tabItemList.get(i);
            tv.setPadding(left, top, right, bottom);
        }
    }


    /**
     * Sets the sliding enabled.
     *
     * @param sliding the new sliding enabled
     */
    public void setSlidingEnabled(boolean sliding) {
        mViewPager.setPagingEnabled(sliding);
    }

}